Nanoparticle Signal Enhancement
Nanoparticle Signal Enhancement - Related Videos
07:30
Rapid Nanoprobe Signal Enhancement by In Situ Gold Nanoparticle Synthesis
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Cited by 5 •
2018
In this work, a protocol for signal enhancement of nanoprobe-based biosensing is presented. The protocol is based on the reduction of chloroauric acid onto the surface of existing nanoprobes that consist of gold, silver, silica or iron-oxide nanoparticles.
01:33
Nanoparticle-Mediated Enhanced Delivery of an Anti-Inflammatory Drug in Microglia-Like Cells
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2025
Take cultures of human monocyte-derived microglia-like cells.Introduce nanoparticles containing an anti-inflammatory drug into the experimental culture and the free drug into the control.The nanoparticles feature a hydrophilic shell and a hydrophobic core encapsulating the lipophilic drug.The cells endocytose the nanoparticles, which release the drug intracellularly, enhancing its delivery.The free drug enters by passive diffusion, a process constrained by the concentration gradient, which...
09:29
Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation
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2011
Plasmonic tweezers and photonic crystal nanostructures are shown to produce useful enhancements in the efficiency and orientation control of optically trapping micro- and nano-particles.
03:53
An Assay to Screen Bioactive Nanoparticles for Toll-Like Receptor Signaling Inhibition
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2025
This video demonstrates a reporter cell-based assay for screening potential bioactive nanoparticles that inhibit Toll-like receptor (TLR) signaling. The assay involves introducing lipopolysaccharides (LPS) mixed with peptide-gold nanoparticle hybrids to reporter macrophages expressing the reporter proteins — secreted embryonic alkaline phosphatase (SEAP) and luciferase. The reduction of LPS-induced TLR signal mediated by the hybrids is determined by measuring the reporter signals.
01:28
Focused Ultrasound-Enhanced Nanoparticle Delivery in a Mouse Model for Tumor Therapy
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2025
Begin with an anesthetized tumor-bearing mouse and shave its head.Place it in an MRI scanner integrated with the focused ultrasound system.The initial MRI scan locates the brain tumor and nearby blood vessels.Inject a contrast agent intravenously, then administer fluorescently labeled nanoparticles coated onto gas-filled microbubbles.The contrast agent and microbubbles circulate and reach the brain.Apply focused ultrasound waves to the tumor site.The ultrasound causes the microbubbles to expand...
FAQs
Nanoparticle surfaces can enrich analyte molecules where detection occurs, increasing the number of relevant molecules contributing to the measurement. Their high surface area also creates more sites for molecular interactions than a larger material with the same overall amount. In chemical sensing, this combination can strengthen the response from trace compounds, biomolecules, or reaction products.
In plasmonic gold or silver nanoparticles, localized surface plasmon resonance amplifies electromagnetic fields near the particle surface. Molecules positioned in these enhanced fields can produce stronger optical responses than they would without the plasmonic material. This mechanism is particularly important for surface-enhanced Raman measurements, where the intensified field supports analysis of very small quantities.
The enhancement strategy can strengthen different kinds of analytical responses depending on the sensing system. Optical measurements may benefit from amplified electromagnetic fields or particle-associated molecular interactions, while electrochemical systems can gain from analyte concentration at nanoparticle surfaces and increased interfacial area. The selected nanoparticle material and detection format therefore determine how the stronger signal is generated.
The relevant features include the particle material, available surface area, and the ability of the surface to interact with the target molecule. Gold and silver are especially relevant when electromagnetic amplification through localized surface plasmon resonance is desired. More generally, effective analyte concentration at the surface and favorable molecular interactions can determine whether the measured response becomes substantially stronger.
A general workflow begins by incorporating nanoscale material into the sensing or detection system, followed by allowing the sample analyte to interact with the nanoparticle surface. The resulting optical or electrochemical response is then measured and interpreted as an enhanced analytical signal. This approach can support smaller sample volumes while improving detection of trace compounds or reaction products.
Applications include trace detection of compounds, biomolecules, and reaction products. In optical analysis, the approach supports surface-enhanced Raman measurements and colorimetric assays. Nanoparticle-assisted systems are useful when a stronger response is needed for selective molecular analysis, particularly when the available sample is limited or the target occurs at a low concentration.
A stronger analytical response can improve the ability to distinguish and measure low-abundance targets, helping lower the detection limit of the chemical method. Surface interactions may also support more selective molecular analysis by concentrating relevant analytes near the sensing region. In practice, researchers can obtain useful information from smaller sample volumes while examining trace compounds, biomolecules, or reaction products.